/**
 * Copyright 2009-2015 the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ibatis.type;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Integer处理转换类
 *
 * @author Clinton Begin
 */
public class IntegerTypeHandler extends BaseTypeHandler<Integer> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, Integer parameter, JdbcType jdbcType)
            throws SQLException {
        ps.setInt(i, parameter);
    }

    @Override
    public Integer getNullableResult(ResultSet rs, String columnName)
            throws SQLException {
        // 版本不一致，这个版本的ResultSet实现做了名称解析，之前版本需要先获取索引再根据索引获取值
        // 老版本: 获得字段的值  int result = rs.getInt(columnName);先通过 rs 判断是否空，如果是空，则返回 null ，否则返回 result
        return rs.getInt(columnName);
    }

    @Override
    public Integer getNullableResult(ResultSet rs, int columnIndex)
            throws SQLException {
        return rs.getInt(columnIndex);
    }

    @Override
    public Integer getNullableResult(CallableStatement cs, int columnIndex)
            throws SQLException {
        return cs.getInt(columnIndex);
    }
}
